SIST EN 300 911 V7.4.1:2003
(Main)Digital cellular telecommunications system (Phase 2+) (GSM); Radio subsystem link control (GSM 05.08 version 7.4.1 Release 1998)
- Abstract
05.08; s31b; CR: A251; R98; 7.3.1; 7.4.0; Correction to mapping of interference levels
- Status
- Published
- Publication Date
- 30-Nov-2003
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Dec-2003
- Due Date
- 01-Dec-2003
- Completion Date
- 01-Dec-2003
SIST EN 300 911 V7.4.1:2003 is the Slovenian adoption of ETSI EN 300 911 Version 7.4.1. It specifies radio subsystem link control for GSM Phase 2+ Release 1998, covering how the mobile station (MS), base station system (BSS), and mobile switching centre (MSC) handle handover, RF power control, radio link failure, idle-mode cell selection and reselection, GPRS mode tasks, and CTS mode tasks.
What does SIST EN 300 911 V7.4.1:2003 specify?
SIST EN 300 911 V7.4.1:2003 specifies the link-control behavior for the GSM radio subsystem in MS, BSS, and MSC implementations. In practice, it tells equipment and network designers how measurements, thresholds, and reporting are used to keep calls, packet sessions, and idle camping working reliably.
The document is organized into clauses for:
- handover
- RF power control
- radio link failure
- idle-mode tasks
- network pre-requisites
- radio link measurements
- control parameters
- GPRS mode tasks
- CTS mode tasks
| Annex | What it covers |
|---|---|
| A | A basic GSM or DCS1800 handover and RF power control algorithm |
| B | Power control procedures |
| C | Change control history |
What are the key requirements of SIST EN 300 911 V7.4.1:2003?
SIST EN 300 911 V7.4.1:2003 is built around measurements and control rules. The main practical point is that the network decides when to hand over, lower power, reselect cells, or release/re-establish a link based on defined radio measurements and parameters.
- Handover: Clause 3 requires the MS to measure serving-cell and surrounding-cell downlink performance, while the BSS measures uplink quality and interference. This matters because handover decisions depend on both ends seeing the link degrade or another cell become better.
- RF power control: Clause 4 requires commanded MS power control on uplink channels, with 2 dB steps and timing rules for how fast the MS changes level. This helps reduce co-channel interference without waiting for a full channel change.
- Radio link failure: Clause 5 defines failure from SACCH decoding success and uses a counter-based algorithm in the MS. In practice, a poor link is either recovered by re-establishment or cleared in a controlled way.
- Idle-mode cell selection and reselection: Clause 6 uses received level averages, BCCH data, BSIC, and criteria such as C1 and C2. This is what keeps an MS camped on a cell it can actually use for paging and access.
- Measurements and reporting: Clause 8 defines RXLEV, RXQUAL, DTX handling, and measurement reports for TCH, SDCCH, and extended measurement reporting. This is the basis for handover tuning and radio optimization.
- Control parameters: Clause 9 lists the broadcast parameters that drive behavior, including access, reselection, hysteresis, penalties, and LSA-related values. Operators use these to tune coverage, priority, and mobility behavior.
- GPRS and CTS: Clauses 10 and 11 adapt the same ideas to packet transfer, PBCCH-based reselection, network-controlled reselection, and CTS-specific link control. That makes the document relevant beyond classic circuit-switched GSM voice.
What terms does SIST EN 300 911 V7.4.1:2003 define?
- Base Station Identity Code (BSIC) - Identifies a surrounding cell so the MS can distinguish between co-channel cells during measurement and handover.
- Received Signal Level (RXLEV) - The coded measure of received signal strength used for handover, reselection, and reporting.
- Received Signal Quality (RXQUAL) - The coded quality measure based on error probability before channel decoding.
- Slow Associated Control Channel (SACCH) - The signaling channel used for measurement reports, power commands, and radio link supervision.
- Packet Broadcast Control Channel (PBCCH) - The packet-mode broadcast channel that carries GPRS reselection and measurement parameters.
- General Packet Radio Service (GPRS) - The packet mode for which the standard defines separate cell reselection and power-control behavior.
- Discrete Transmission (DTX) - A transmission mode where some frames are not sent, which affects how measurements are taken and reported.
Who uses SIST EN 300 911 V7.4.1:2003?
SIST EN 300 911 V7.4.1:2003 is used by MS, BSS, and MSC implementers, network operators, test labs, and approval teams. It matters for anyone designing radio algorithms, setting broadcast parameters, validating interworking, or checking that a device reports and reacts to measurements in the expected way.
Which standards are used with SIST EN 300 911 V7.4.1:2003?
The standard relies on a set of companion GSM and ETSI documents:
- GSM01.04 - abbreviations and acronyms used in the document
- GSM03.09 - handover procedures
- GSM03.22 - idle-mode and group receive mode behavior
- GSM04.04 and GSM04.08 - Layer 1 and Layer 3 signaling details
- GSM05.02, GSM05.05, GSM05.10 - multiplexing, radio transmission/reception, and synchronization
- GSM03.64 and GSM04.60 - GPRS radio interface and packet-mode signaling
- GSM03.52, GSM04.56, GSM05.56 - CTS radio interface and CTS-FP subsystem
- GSM08.08 and GSM08.58 - MSC-BSS and BSC-BTS interface signaling
What does the SIST EN 300 911 V7.4.1:2003 document contain?
SIST EN 300 911 V7.4.1:2003 contains the procedures, formulas, thresholds, and reporting formats that turn radio measurements into network actions. It includes the mappings for signal level and quality, counter-based failure logic, cell reselection equations, and the parameter tables that drive broadcast and measurement behavior.
It also includes examples of basic handover and power-control algorithms in Annex A and power-control procedure examples in Annex B. For implementers, these parts are useful when turning the clause text into software, test cases, or network tuning rules.
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Frequently Asked Questions
SIST EN 300 911 V7.4.1:2003 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Digital cellular telecommunications system (Phase 2+) (GSM); Radio subsystem link control (GSM 05.08 version 7.4.1 Release 1998)". This standard covers: 05.08; s31b; CR: A251; R98; 7.3.1; 7.4.0; Correction to mapping of interference levels
05.08; s31b; CR: A251; R98; 7.3.1; 7.4.0; Correction to mapping of interference levels
SIST EN 300 911 V7.4.1:2003 is classified under the following ICS (International Classification for Standards) categories: 33.070.50 - Global System for Mobile Communication (GSM). The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 300 911 V7.4.1:2003 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Digital cellular telecommunications system (Phase 2+) (GSM); Radio subsystem link control (GSM 05.08 version 7.4.1 Release 1998)33.070.50Globalni sistem za mobilno telekomunikacijo (GSM)Global System for Mobile Communication (GSM)ICS:Ta slovenski standard je istoveten z:EN 300 911 Version 7.4.1SIST EN 300 911 V7.4.1:2003en01-december-2003SIST EN 300 911 V7.4.1:2003SLOVENSKI
STANDARD
ETSIEN300911V7.4.1(2000-10)EuropeanStandard(Telecommunicationsseries)Digitalcellulartelecommunicationssystem(Phase2+);Radiosubsystemlinkcontrol(GSM05.08version7.4.1Release1998)GLOBALSYSTEMFORMOBILECOMMUNICATIONSRSIST EN 300 911 V7.4.1:2003
ETSIETSIEN300911V7.4.1(2000-10)2(GSM05.08version7.4.1Release1998)ReferenceREN/SMG-020508Q7R2KeywordsDigitalcellulartelecommunicationssystem,GlobalSystemforMobilecommunications(GSM)ETSI650RoutedesLuciolesF-06921SophiaAntipolisCedex-FRANCETel.:+33492944200Fax:+33493654716SiretN°34862356200017-NAF742CAssociationàbutnonlucratifenregistréeàlaSous-PréfecturedeGrasse(06)N°7803/88ImportantnoticeIndividualcopiesofthepresentdocumentcanbedownloadedfrom:http://www.etsi.orgThepresentdocumentmaybemadeavailableinmorethanoneelectronicversionorinprint.Inanycaseofexistingorperceiveddifferenceincontentsbetweensuchversions,thereferenceversionisthePortableDocumentFormat(PDF).Incaseofdispute,thereferenceshallbetheprintingonETSIprintersofthePDFversionkeptonaspecificnetworkdrivewithinETSISecretariat.Usersofthepresentdocumentshouldbeawarethatthedocumentmaybesubjecttorevisionorchangeofstatus.InformationonthecurrentstatusofthisandotherETSIdocumentsisavailableathttp://www.etsi.org/tb/status/Ifyoufinderrorsinthepresentdocument,sendyourcommentto:editor@etsi.frCopyrightNotificationNopartmaybereproducedexceptasauthorizedbywrittenpermission.Thecopyrightandtheforegoingrestrictionextendtoreproductioninallmedia.©EuropeanTelecommunicationsStandardsInstitute2000.Allrightsreserved.SIST EN 300 911 V7.4.1:2003
ETSIETSIEN300911V7.4.1(2000-10)3(GSM05.08version7.4.1Release1998)ContentsIntellectualPropertyRights.6Foreword.61Scope.71.1References.71.2Abbreviations.82General.83Handover.93.1Overallprocess.93.2MSmeasurementprocedure.93.3BSSmeasurementprocedure.93.4Strategy.94RFpowercontrol.104.1Overallprocess.104.2MSimplementation.104.3MSpowercontrolrange.104.4BSSimplementation.114.5BSSpowercontrolrange.114.6Strategy.114.7Timing.114.8Dedicatedchannelsusedforavoicegroupcallorvoicebroadcast.115Radiolinkfailure.125.1Criterion.125.2MSprocedure.125.3BSSprocedure.126Idlemodetasks.136.1Introduction.136.2Measurementsfornormalcellselection.136.3Measurementsforstoredlistcellselection.146.4Criteriaforcellselectionandreselection.146.5Downlinksignallingfailure.156.6MeasurementsforCellReselection.166.6.1MonitoringofreceivedsignallevelandBCCHdata.166.6.2Pathlosscriteriaandtimingsforcellre-selection.176.6.3CellreselectionalgorithmforSoLSA.186.7ReleaseofTCHandSDCCH.186.7.1Normalcase.186.7.2Callre-establishment.196.8Abnormalcasesandemergencycalls.197Networkpre-requisites.207.1BCCHcarriers.207.2IdentificationofsurroundingBSSforhandovermeasurements.208Radiolinkmeasurements.218.1Signallevel.218.1.1General.218.1.2Physicalparameter.218.1.3Statisticalparameters.228.1.4Rangeofparameter.238.2Signalquality.238.2.1General.238.2.2Physicalparameter.238.2.3Statisticalparameters.23SIST EN 300 911 V7.4.1:2003
ETSIETSIEN300911V7.4.1(2000-10)4(GSM05.08version7.4.1Release1998)8.2.4Rangeofparameter.238.3Aspectsofdiscontinuoustransmission(DTX).248.4Measurementreporting.258.4.1MeasurementreportingfortheMSonaTCH.258.4.2MeasurementreportingfortheMSonaSDCCH.268.4.3AdditionalcellreportingrequirementsformultibandMS.268.4.4CommonaspectsfortheMSonaTCHoraSDCCH.278.4.5MeasurementreportingfortheBSS.278.4.6Extendedmeasurementreporting.288.5AbsoluteMS-BTSdistance.288.5.1General.288.5.2Physicalparameter.289Controlparameters.2910GPRSmodetasks.3110.1CellRe-selection.3110.1.1MonitoringthereceivedsignallevelandPBCCHdata.3110.1.1.1Packetidlemode.3110.1.1.2Packettransfermode.3210.1.2CellRe-selectionCriteria.3310.1.3CellRe-selectionAlgorithm.3410.1.3.1Abnormalcellreselection.3510.1.4NetworkcontrolledCellre-selection.3510.1.4.1Measurementreporting.3610.1.4.2Cellre-selectioncommand.3610.1.4.3Exceptionalcases.3710.1.5ExtendedMeasurementreporting.3710.2RFPowerControl.3810.2.1MSoutputpower.3810.2.2BTSoutputpower.3910.2.3MeasurementsatMSside.4010.2.3.1DerivingtheCvalue.4110.2.3.1.1Packetidlemode.4110.2.3.1.2Packettransfermode.4110.2.3.2DerivationofChannelQualityReport.4210.2.3.2.1Packettransfermode.4310.2.3.2.2Packetidlemode.4410.2.3.2.3Measurementreporting.4510.2.4MeasurementsatBSSside.4510.3Measurementrequirements.4510.4Controlparameters.4611CTSmodetasks.4811.1CTSidlemodetasks.4811.1.1CTScellselection.4811.1.1.1SynchronizationandmeasurementsforCTScellselection.4811.1.1.2InitialsychronizationofCTS-MS.4811.1.2CriterionforCTScellselection.4911.1.3MonitoringofCTSBCHandCTSPCH.4911.1.3.1Monitoringofreceivedsignallevel.4911.1.3.2Downlinkbeaconfailure.4911.1.3.3Downlinkpagingfailure.4911.1.4ProcedureswithreportingtotheCTS-FP.5011.1.4.1AFAmonitoring.5011.1.4.2BCCHdetection.5011.1.4.3ObservedFrequencyOffset(OFO)measurement.5011.2Intra-cellhandover.5111.2.1Overallprocess.5111.2.2CTS-MSmeasurementprocedure.5111.2.3CTS-FPmeasurementprocedure.5111.2.4Strategy.5111.3RFpowercontrol.51SIST EN 300 911 V7.4.1:2003
ETSIETSIEN300911V7.4.1(2000-10)5(GSM05.08version7.4.1Release1998)11.3.1Overallprocess.5111.3.2CTS-MSimplementation.5111.3.3CTS-MSpowercontrolrange.5211.3.4CTS-FPimplementation.5211.3.5CTS-FPpowercontrolrange.5211.3.6Strategy.5211.3.7Timing.5211.4Radiolinkfailure.5311.4.1Criterion.5311.4.2CTS-MSprocedure.5311.4.3CTS-FPprocedure.5311.5Radiolinkmeasurements.5311.5.1Signalstrength.5311.5.1.1General.5311.5.1.2Physicalparameter.5411.5.1.3Statisticalparameters.5411.5.1.4Rangeofparameter.5411.5.2Signalquality.5411.5.2.1General.5411.5.2.2Physicalparameter.5411.5.2.3Statisticalparameters.5411.5.2.4Rangeofparameter.5411.5.3Aspectsofdiscontinuoustransmission(DTX).5411.5.4MeasurementreportingfortheCTS-MSonaTCH.5411.6ControlofCTS-FPservicerange.5511.7Controlparameters.55AnnexA(informative):DefinitionofabasicGSMorDCS1800handoverandRFpowercontrolalgorithm.57A.1Scope.57A.2Functionalrequirement.57A.3BSSpre-processingandthresholdcomparisons.58A.3.1Measurementaveragingprocess.58A.3.2Thresholdcomparisonprocess.59A.3.2.1RFpowercontrolprocess.59A.3.2.2HandoverProcess.60A.4BSSdecisionalgorithm.61A.4.1Internalintracellhandoveraccordingtoradiocriteria:(Interferenceproblems).62A.4.2Internalhandoveraccordingtoothercriteria.62A.4.3Generalconsiderations.62A.5Channelallocation.62A.6HandoverdecisionalgorithmintheMSC.63AnnexB(informative):PowerControlProcedures.65B.1Openloopcontrol.65B.2Closedloopcontrol.66B.3Qualitybasedcontrol.66B.4BTSpowercontrol.67B.5Example.67AnnexC(informative):Changecontrolhistory.69History.71SIST EN 300 911 V7.4.1:2003
ETSIETSIEN300911V7.4.1(2000-10)6(GSM05.08version7.4.1Release1998)IntellectualPropertyRightsIPRsessentialorpotentiallyessentialtothepresentdocumentmayhavebeendeclaredtoETSI.TheinformationpertainingtotheseessentialIPRs,ifany,ispubliclyavailableforETSImembersandnon-members,andcanbefoundinETSISR000314:"IntellectualPropertyRights(IPRs);Essential,orpotentiallyEssential,IPRsnotifiedtoETSIinrespectofETSIstandards",whichisavailablefromtheETSISecretariat.LatestupdatesareavailableontheETSIWebserver(http://www.etsi.org/ipr).PursuanttotheETSIIPRPolicy,noinvestigation,includingIPRsearches,hasbeencarriedoutbyETSI.NoguaranteecanbegivenastotheexistenceofotherIPRsnotreferencedinETSISR000314(ortheupdatesontheETSIWebserver)whichare,ormaybe,ormaybecome,essentialtothepresentdocument.ForewordThisEuropeanStandard(Telecommunicationsseries)hasbeenproducedbyETSITechnicalCommitteeSpecialMobileGroup(SMG).ThepresentdocumentspecifiestheRadiosub-systemlinkcontrolimplementedintheMobileStation(MS),BaseStationSystem(BSS)andMobileSwitchingCentre(MSC)ofthedigitalmobilecellularandpersonalcommunicationsystemsoperatinginthe900MHzand1800MHzband(GSM900andDCS1800).ThecontentsofthepresentdocumentmaybesubjecttocontinuingworkwithinSMGandmaychangefollowingformalSMGapproval.ShouldSMGmodifythecontentsofthepresentdocumentitwillthenbere-submittedforformalapprovalproceduresbyETSIwithanidentifyingchangeofreleasedateandanincreaseinversionnumberasfollows:Version7.x.ywhere:7GSMPhase2+Release1998xtheseconddigitisincrementedforchangesofsubstance,i.e.technicalenhancements,corrections,updates,etc.;ythethirddigitisincrementedwheneditorialonlychangeshavebeenincorporatedinthespecification.NationaltranspositiondatesDateofadoptionofthepresentdocument:29September2000Dateoflatestannouncementofthepresentdocument(doa):31December2000DateoflatestpublicationofnewNationalStandardorendorsementofthepresentdocument(dop/e):30June2001DateofwithdrawalofanyconflictingNationalStandard(dow):30June2001SIST EN 300 911 V7.4.1:2003
ETSIETSIEN300911V7.4.1(2000-10)7(GSM05.08version7.4.1Release1998)1ScopeThepresentdocumentspecifiestheRadiosub-systemlinkcontrolimplementedintheMobileStation(MS),BaseStationSystem(BSS)andMobileSwitchingCentre(MSC)oftheGSM,DCS1800andPCS1900systems.Unlessotherwisespecified,referencestoGSMalsoincludeDCS1800.1.1ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.• Referencesareeitherspecific(identifiedbydateofpublication,editionnumber,versionnumber,etc.)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,thelatestversionapplies.• Anon-specificreferencetoanETSshallalsobetakentorefertolaterversionspublishedasanENwiththesamenumber.• ForthisRelease1998document,referencestoGSMdocumentsareforRelease1998versions(version7.x.y).[1]GSM01.04:"Digitalcellulartelecommunicationssystem(Phase2+);Abbreviationsandacronyms".[2]GSM03.03:"Digitalcellulartelecommunicationssystem(Phase2+);Numbering,addressingandidentification".[3]GSM03.09:"Digitalcellulartelecommunicationssystem(Phase2+);Handoverprocedures".[4]GSM03.22:"Digitalcellulartelecommunicationssystem(Phase2+);FunctionsrelatedtoMobileStation(MS)inidlemodeandgroupreceivemode".[5]GSM04.04:"Digitalcellulartelecommunicationssystem(Phase2+);Layer1;Generalrequirements".[6]GSM04.06:"Digitalcellulartelecommunicationssystem(Phase2+);MobileStation-BaseStationSystem(MS-BSS)interface;DataLink(DL)layerspecification".[7]GSM04.08:"Digitalcellulartelecommunicationssystem(Phase2+);Mobileradiointerfacelayer3specification".[8]GSM05.02:"Digitalcellulartelecommunicationssystem(Phase2+);Multiplexingandmultipleaccessontheradiopath".[9]GSM05.05:"Digitalcellulartelecommunicationssystem(Phase2+);Radiotransmissionandreception".[10]GSM05.10:"Digitalcellulartelecommunicationssystem(Phase2+);Radiosubsystemsynchronization".[11]GSM06.11:"Digitalcellulartelecommunicationssystem;Fullratespeech;Substitutionandmutingoflostframesforfullratespeechchannels".[12]GSM08.08:"Digitalcellulartelecommunicationssystem(Phase2+);Mobile-servicesSwitchingCentre-BaseStationSystem(MSC-BSS)interface,Layer3specification".[13]GSM08.58:"Digitalcellulartelecommunicationssystem(Phase2+);BaseStationController-BaseTransceiverStation(BSC-BTS)interface;Layer3specification".SIST EN 300 911 V7.4.1:2003
ETSIETSIEN300911V7.4.1(2000-10)8(GSM05.08version7.4.1Release1998)[14]GSM11.10:"Digitalcellulartelecommunicationssystem(Phase2+);MobileStation(MS)conformityspecification".[15]GSM03.64:"Digitalcellulartelecommunicationssystem(Phase2+);GeneralPacketRadioService(GPRS);OveralldescriptionoftheGPRSRadioInterface;Stage2".[16]GSM03.52:"Digitalcellulartelecommunicationssystem(Phase2+);GSMCordlessTelephonySystem(CTS),Phase1;LowerlayersoftheCTSRadioInterface;Stage2".[17]GSM04.56:"Digitalcellulartelecommunicationssystem(Phase2+);GSMCordlessTelephonySystem(CTS),Phase1;CTSradiointerfacelayer3specification".[18]GSM05.56:"Digitalcellulartelecommunicationssystem(Phase2+);GSMCordlessTelephonySystem(CTS),Phase1;CTS-FPradiosubsystem".1.2AbbreviationsAbbreviationsusedinthepresentdocumentarelistedinGSM01.04.2GeneralTheradiosub-systemlinkcontrolaspectsthatareaddressedareasfollows:-Handover;-RFPowercontrol;-RadiolinkFailure;-Cellselectionandre-selectioninIdlemode,inGroupReceivemodeandinGPRSmode(seeGSM03.22);-CTSmodetasks.HandoverisrequiredtomaintainacallinprogressasaMSengagedinapoint-to-pointcallorwithaccesstotheuplinkofachannelusedforavoicegroupcallpassesfromonecellcoverageareatoanotherandmayalsobeemployedtomeetnetworkmanagementrequirements,e.g.reliefofcongestion.HandovermayoccurduringacallfromoneTCHormultipleTCHs(inthecaseofmultislotconfiguration)toanotherTCHormultipleTCHs.ItmayalsooccurfromDCCHtoDCCHorfromDCCHtooneormultipleTCH(s),e.g.duringtheinitialsignallingperiodatcallset-up.Thehandovermaybeeitherfromchannel(s)ononecelltootherchannel(s)onasurroundingcell,orbetweenchannelsonthesamecellwhicharecarriedonthesamefrequencyband.Examplesaregivenofhandoverstrategies,however,thesewillbedeterminedindetailbythenetworkoperator.ForamultibandMS,specifiedinGSM02.06,thehandoverdescribedisalsoallowedbetweenanychannelsondifferentcellswhicharecarriedondifferentfrequencybands,e.g.betweenaGSM900/TCHandaDCS1800/TCH.Handoverbetweentwoco-locatedcells,carriedondifferentfrequencybands,isconsideredasinter-cellhandoverirrespectiveofthehandoverproceduresused.AdaptivecontroloftheRFtransmitpowerfromanMSandoptionallyfromtheBSSisimplementedinordertooptimizetheuplinkanddownlinkperformanceandminimizetheeffectsofco-channelinterferenceinthesystem.Thecriteriafordeterminingradiolinkfailurearespecifiedinordertoensurethatcallswhichfaileitherfromlossofradiocoverageorunacceptableinterferencearesatisfactorilyhandledbythenetwork.Radiolinkfailuremayresultineitherre-establishmentorreleaseofthecallinprogress.Forchannelsusedforavoicegroupcall,anradiouplinkfailureresultsinthefreeingupoftheuplink.Proceduresforcellselectionandre-selectionwhilstinIdlemode(i.e.notactivelyprocessingacall),arespecifiedinordertoensurethatamobileiscampedonacellwithwhichitcanreliablycommunicateonboththeradiouplinkanddownlink.TheoperationsofanMSinIdleModearespecifiedinGSM03.22.SIST EN 300 911 V7.4.1:2003
ETSIETSIEN300911V7.4.1(2000-10)9(GSM05.08version7.4.1Release1998)Cellre-selectionisalsoperformedbytheMSwhenattachedtoGPRS,exceptwhentheMSsimultaneouslyhasacircuitswitchedconnection.Optionalproceduresarealsospecifiedfornetworkcontrolledcellre-selectionforGPRS.Cellre-selectionforGPRSisdefinedinsubclause10.1.AnMSlisteningtoavoicegroupcalloravoicebroadcastusecellre-selectionprocedurestochangecell.Thismaybesupportedbyalistofcellscarryingthevoicegrouporvoicebroadcastcalldownlink,providedtotheMSbythenetwork.TheoperationsofanMSinGroupReceiveModearespecifiedinGSM03.22.InformationsignalledbetweentheMSandBSSissummarizedintables1,2and3.AfullspecificationoftheLayer1headerisgiveninGSM04.04,andoftheLayer3fieldsinGSM04.08.ForCTS,informationsignalledbetweentheCTS-MSandCTS-FPissummarizedintables4,5and6.AfullspecificationoftheCTSLayer3fieldsisgiveninGSM04.56.3Handover3.1OverallprocessTheoverallhandoverprocessisimplementedintheMS,BSSandMSC.Measurementofradiosubsystemdownlinkperformanceandsignallevelsreceivedfromsurroundingcells,ismadeintheMS.ThesemeasurementsaresignalledtotheBSSforassessment.TheBSSmeasurestheuplinkperformancefortheMSbeingservedandalsoassessesthesignallevelofinterferenceonitsidletrafficchannels.InitialassessmentofthemeasurementsinconjunctionwithdefinedthresholdsandhandoverstrategymaybeperformedintheBSS.AssessmentrequiringmeasurementresultsfromotherBTSorotherinformationresidentintheMSC,maybeperformedintheMSC.GSM03.09describesthehandoverprocedurestobeusedinPLMNs.3.2MSmeasurementprocedureAprocedureshallbeimplementedintheMSbywhichitmonitorsthedownlinkRXsignallevelandqualityfromitsservingcellandthedownlinkRXsignallevelandBSICofsurroundingBTS.ThemethodofidentificationofsurroundingBTSisdescribedinsubclause7.2.TherequirementsfortheMSmeasurementsaregiveninsubclause8.1.3.3BSSmeasurementprocedureAprocedureshallbeimplementedintheBSSbywhichitmonitorstheuplinkRXsignallevelandqualityfromeachMSbeingservedbythecell.Inthecaseofamultislotconfigurationtheevaluationshallbeperformedonatimeslotpertimeslotbasis.AprocedureshallbeimplementedbywhichtheBSSmonitorsthelevelsofinterferenceonitsidletrafficchannels.3.4StrategyThehandoverstrategyemployedbythenetworkforradiolinkcontroldeterminesthehandoverdecisionthatwillbemadebasedonthemeasurementresultsreportedbytheMS/BSSandvariousparameterssetforeachcell.Networkdirectedhandovermayalsooccurforreasonsotherthanradiolinkcontrol,e.g.tocontroltrafficdistributionbetweencells.Theexacthandoverstrategieswillbedeterminedbythenetworkoperator,adetailedexampleofabasicoverallalgorithmappearsinannexA.Possibletypesofhandoverareasfollows:Inter-cellhandover:IntercellhandoverfromtheservingcelltoasurroundingcellwillnormallyoccureitherwhenthehandovermeasurementsshowlowRXLEVand/orRXQUALonthecurrentservingcellandabetterRXLEVavailablefromasurroundingcell,orwhenasurroundingcellallowscommunicationwithalowerTXpowerlevel.ThistypicallyindicatesthatanMSisontheborderofthecellarea.IntercellhandovermayalsooccurfromtheDCCHontheservingcelltoaTCHormultislotconfigurationonanothercellduringcallestablishment.ThismaybeusedasameansofprovidingsuccessfulcallestablishmentwhennoTCHresourceisavailableonthecurrentservingcell.SIST EN 300 911 V7.4.1:2003
ETSIETSIEN300911V7.4.1(2000-10)10(GSM05.08version7.4.1Release1998)Inter-cellhandoverbetweencellsusingdifferentfrequencybandsisallowedforamultibandMS.Intra-cellhandover:Intra-cellhandoverfromonechannel/timeslotintheservingcelltoanotherchannel/timeslotinthesamecellwillnormallybeperformedifthehandovermeasurementsshowalowRXQUAL,butahighRXLEVontheservingcell.ThisindicatesadegradationofqualitycausedbyinterferenceeventhoughtheMSissituatedwithintheservingcell.Theintra-cellhandovershouldprovideachannelwithalowerlevelofinterference.Intra-cellhandovercanoccureithertoatimeslotonanewcarrierortoadifferenttimeslotonthesamecarrier.Similarly,intra-cellhandovermayoccurbetweendifferentmultislotconfigurationsinthesamecell.Thesemultislotconfigurationsmaycomprisedifferentnumberoftimeslotsandmaypartlyoverlap.Intra-cellhandoverfromoneofthebandsofoperationtoanotheroneisallowedforamultibandMS.GSM08.08definesthecausesforhandoverthatmaybesignalledfromBSStoMSC.4RFpowercontrol4.1OverallprocessRFpowercontrolisemployedtominimizethetransmitpowerrequiredbyMSorBSSwhilstmaintainingthequalityoftheradiolinks.Byminimizingthetransmitpowerlevels,interferencetoco-channelusersisreduced.4.2MSimplementationRFpowercontrolshallbeimplementedintheMS.ThepowercontrolleveltobeemployedbytheMSoneachuplinkchannel,exceptPDCH,isindicatedbymeansofthepowercontrolinformationsenteitherinthelayer1headerofeachSACCHmessageblock(seeGSM04.04)onthecorrespondingdownlinkchannel,orinadedicatedsignallingblock(seeGSM04.08).PowercontrolforPDCHisdefinedinsubclause10.2.TheMSshallemploythemostrecentlycommandedpowercontrollevelappropriatetoeachchannelforalltransmittedburstsoneitheraTCH(includinghandoveraccessburst),FACCH,SACCHorSDCCH.TheMSshallconfirmthepowercontrollevelthatitiscurrentlyemployingintheSACCHL1headeroneachuplinkchannel.TheindicatedvalueshallbethepowercontrollevelactuallyusedbythemobileforthelastburstofthepreviousSACCHperiod.Incaseofamultislotconfiguration,eachbi-directionalchannelshallbepowercontrolledindividuallybythecorrespondingSACCH.Powercontrolinformationondownlinkunidirectionalchannelsshallbeneglected.WhenaccessingacellontheRACH(randomaccess)andbeforereceivingthefirstpowercommandduringacommunicationonaDCCHorTCH(afteranIMMEDIATEASSIGNMENT),allGSMandclass1andclass2DCS1800MSshallusethepowerleveldefinedbytheMS_TXPWR_MAX_CCHparameterbroadcastontheBCCHofthecell.Theclass3DCS1800MSshallusethepowerleveldefinedbyMSTXPWRMAXCCHplusthevaluePOWEROFFSETalsobroadcastontheBCCHofthecell.IfapowercontrolleveldefinedinGSM05.05isreceivedbutthelevelisnotsupportedbytheMS,theMSshallusethesupportedoutputpowerwhichisclosesttotheoutputpowerindicatedbythereceivedpowercontrollevel.4.3MSpowercontrolrangeTherangeoverwhichaMSshallbecapableofvaryingitsRFoutputpowershallbefromitsmaximumoutputdowntoitsminimum,instepsofnominally2dB.GSM05.05givesadetaileddefinitionoftheRFpowerlevelstepsizeandtolerances.SIST EN 300 911 V7.4.1:2003
ETSIETSIEN300911V7.4.1(2000-10)11(GSM05.08version7.4.1Release1998)4.4BSSimplementationRFpowercontrolmayoptionallybeimplementedintheBSS.4.5BSSpowercontrolrangeTherangeoverwhichtheBSSshallbecapableofreducingitsRFoutputpowerfromitsmaximumlevelshallbenominally30dB,in15stepsofnominally2dB.GSM05.05givesadetaileddefinitionoftheRFpowerlevelstepsizeandtolerances.4.6StrategyTheRFpowercontrolstrategyemployedbythenetworkdeterminestheorderedpowerlevelthatissignalledtotheMS,andthepowerlevelthatisemployedbytheBSS.ThepowerleveltobeemployedineachcasewillbebasedonthemeasurementresultsreportedbytheMS/BTSandvariousparameterssetforeachcell.Theexactstrategieswillbedeterminedbythenetworkoperator.AdetailedexampleofabasicalgorithmappearsinannexA.4.7TimingUponreceiptofacommandfromanSACCHtochangeitspowerlevelonthecorrespondinguplinkchannel,theMSshallchangetothenewlevelatarateofonenominal2dBpowercontrolstepevery60ms(13TDMAframes),i.e.arangechangeof15stepsshouldtakeabout900ms.ThechangeshallcommenceatthefirstTDMAframebelongingtothenextreportingperiod(asspecifiedinsubclause8.4).TheMSshallchangethepoweronenominal2dBstepatatime,atarateofonestepevery60msfollowingtheinitialchange,irrespectiveofwhetheractualtransmissiontakesplaceornot.Incaseofchannelchange,exceptformultislotconfigurationchange,thecommandedpowercontrollevelshallbeappliedoneachnewchannelimmediately.ThemultislotconfigurationchangemessagedoesnotcommandtheMStousenewpowercontrollevels.ForthosetimeslotsnotusedbytheMSbeforethemultislotconfigurationchangeprocedure,theMSshallusethepowercontrollevelusedonthemainchannelbeforethemultislotconfigurationchange.4.8DedicatedchannelsusedforavoicegroupcallorvoicebroadcastThenetworkshallnotallocatetheuplinkofthechannelusedforavoicegroupcalltomorethanoneMS.Ifmarkedbusy,nootherMSshalltransmitonthechannel.Thismarkingisindicatedbythenetwork,asdefinedinGSM03.68and04.08.AnyMSallocatedtheuplinkofachannelusedforavoicegroupcallshallonlytransmitiftheuplinkismarkedbusy,andshallstopusingtheuplinkifithappenstobecomemarkedfree.AnMSnotallocatedtheuplinkmayperformarandomaccessprocedureontheuplinktogainaccesstotalk,onlyiftheuplinkismarkedasfree.Onachannelusedduringavoicegroupcall,theuplinkpowercontrolshallonlyapplytotheMScurrentlyallocatedthatuplink,andtheMSpowercontrollevelorderedbythenetworkshallbeignoredbyallotherMSslisteningtothedownlink.Whenperformingarandomaccessonacelltogainaccesstotheuplinkofachannelusedforavoicegroupcall,untilreceivingthefirstdedicatedpowercommandfromthenetwork,theMSshallusethelastreceivedpowerlevelcommandasdefinedbytheMS_TXPWR_MAX_CCHparameterbroadcastontheBCCHofthecell,orifMS_TXPWR_MAX_CCHcorrespondstoapowercontrollevelnotsupportedbytheMSasdefinedbyitspowerclassinGSM05.05,theMSshallactasthoughtheclosestsupportedpowercontrollevelhadbeenbroadcast.RFdownlinkpowercontrolwillnormallynotbeappliedonchannelsusedforavoicegroupcallorvoicebroadcast.SIST EN 300 911 V7.4.1:2003
ETSIETSIEN300911V7.4.1(2000-10)12(GSM05.08version7.4.1Release1998)5Radiolinkfailure5.1CriterionThecriterionfordeterminingRadioLinkFailureintheMSshallbebasedonthesuccessrateofdecodingmessagesonthedownlinkSACCH.Foracircuitswitchedmultislotconfiguration,onlythemainSACCHshallbeusedfordeterminingRadioLinkFailure.ForGPRS,RadioLinkFailureisdeterminedbytheRLC/MACprotocol(seeGSM04.60).5.2MSprocedureTheaimofdeterminingradiolinkfailureintheMSistoensurethatcallswithunacceptablevoice/dataquality,whichcannotbeimprovedeitherbyRFpowercontrolorhandover,areeitherre-establishedorreleasedinadefinedmanner.Ingeneraltheparametersthatcontroltheforcedreleaseshouldbesetsuchthattheforcedreleasewillnotnormallyoccuruntilthecallhasdegradedtoaqualitybelowthatatwhichthemajorityofsubscriberswouldhavemanuallyreleased.Thepresentdocumentsuresthat,forexample,acallontheedgeofaradiocoveragearea,althoughofbadquality,canusuallybecompletedifthesubscriberwishes.TheradiolinkfailurecriterionisbasedontheradiolinkcounterS.IftheMSisunabletodecodeaSACCHmessage(BFI=1),Sisdecreasedby1.InthecaseofasuccessfulreceptionofaSACCHmessage(BFI=0)Sisincreasedby2.InanycaseSshallnotexceedthevalueofRADIO_LINK_TIMEOUT.IfSreaches0aradiolinkfailureshallbedeclared.TheactiontobetakenisspecifiedinGSM04.08.TheRADIO_LINK_TIMEOUTparameteristransmittedbyeachBSSintheBCCHdata(seetable1).TheMSshallcontinuetransmittingasnormalontheuplinkuntilSreaches0.ThealgorithmshallstartaftertheassignmentofadedicatedchannelandSshallbeinitializedtoRADIO_LINK_TIMEOUT.Thedetailedoperationshallbeasfollows:-theradiolinktime-outalgorithmshallbestoppedatthereceptionofachannelchangecommand;-(re-)initializationandstartofthealgorithmshallbedonewhenevertheMSswitchestoanewchannel(thisincludestheoldchannelinassignmentandhandoverfailurecases),atthelatestwhenthemainsignallinglink(seeGSM04.08)hasbeenestablished;-theRADIO_LINK_TIMEOUTvalueusedat(re-)initializationshallbethatusedonthepreviouschannel(intheImmediateAssignmentcasethevaluereceivedontheBCCH),orthevaluereceivedonSACCHiftheMShasreceivedaRADIO_LINK_TIMEOUTvalueonthenewchannelbeforetheinitialization;-ifthefirstRADIO_LINK_TIMEOUTvalueontheSACCHisreceivedonthenewchannelaftertheinitialization,thecountershallbere-initializedwiththenewvalue.AnMSlisteningtoavoicegroupcalloravoice
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